Real-time DeFi risk on Base: Aave V3 health, executable swap quotes, token exit-liquidity checks.
Quick Install
Automated & IDE SetupCopy the AI prompt to install this server into Claude Code, Cursor, or another agent — or use 1-click editor setup below.
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Manual Client & Custom JSON ConfigExpand JSON ▾
Client Config & Setup
Choose your client or environment
Target File:
💡 Paste the JSON block into your client's configuration file under mcpServers, then restart the application.
Documentation Overview
DeFi Guard MCP
The safety layer that checks a DeFi transaction or token before your agent (or you) signs — on Base L2. Sits in front of execution MCPs (it pairs with them, it doesn't compete): honeypot detection, owner-power scans, approval-drain checks, position health, and executable prices — all from live on-chain state.
No API keys required — works out of the box against public Base RPCs (bring your own RPC for speed via BASE_RPC_URL). Read-only: it never holds keys, signs, or submits.
Guard-before-signing tools
| Tool | What it answers |
|---|---|
token_safety_screen | "Is this token safe to buy/approve before I sign?" — honeypot detection (can you actually sell it back?), real round-trip cost (fees + tax both ways), and whether ownership is renounced (a live owner can often change taxes / pause / mint). One risk verdict. |
scan_dangerous_capabilities | "What can the owner do to me?" — scans the deployed bytecode for owner-only powers: mint, pause, blacklist, adjustable fees/taxes, max-tx limits, trading toggles, proxy upgradeTo. Flags the capability, no explorer key needed. |
approval_risk | "Is this approval dangerous?" — reads the live allowance an owner granted a spender, flags unlimited approvals (the allowance-drain vector) and whether the spender is a contract or an EOA. Current exposure = what could be pulled right now. |
Data tools
| Tool | What it answers |
|---|---|
aave_position_health | "Is this Aave V3 position safe?" — live health factor, collateral/debt in USD, LTV, liquidation threshold, and a plain risk level (healthy / elevated / critical / LIQUIDATABLE). |
quote_swap | "What would this swap actually return right now?" — exact-input quote via Uniswap V3 QuoterV2, best of all 4 fee tiers, with gas estimate. Executable price, not an oracle. |
token_risk_snapshot | "Can I get out of this token?" — ERC-20 metadata + real market depth measured by round-trip quotes (WETH → token → WETH) at two sizes. High round-trip loss = thin or trapped liquidity, whatever the chart says. |
Why round-trip depth instead of "liquidity" numbers
TVL and pool-size numbers are easy to fake and easy to misread. A round-trip quote against live state measures the only thing that matters: what you lose entering and exiting right now (fees + price impact, both ways). If a token can be bought but not sold, this tool says so (UNTRADABLE).
Install
Claude Code
Any MCP client (Cursor, Windsurf, etc.)
BASE_RPC_URL is optional; without it the server rotates across public Base endpoints with automatic fallback and retries.
Example
"Before I approve TOKEN X to this router, is any of it risky?"
The agent calls token_safety_screen (can I sell it back? is ownership renounced?), scan_dangerous_capabilities (can the owner mint/blacklist/pause?), and approval_risk (is this an unlimited allowance to an EOA?) — and answers with live on-chain facts instead of vibes, before you sign.
Honesty notes (read this)
- Quotes are simulations against live state (
eth_call). Real execution adds slippage between quote and inclusion. - Contract addresses (Aave V3 Pool, QuoterV2) are Base mainnet constants, validated against live chain state.
- This is a read-only tool. It never holds keys, signs, or submits transactions.
- Not financial advice; it reports on-chain state, decisions are yours.
Test
License
MIT
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